Time	Events
Case 1	Five years prior to admission	Medical history of dyslipidaemia and hypertension and diabetes mellitus.
	Eight months prior to admission	Patient was suffering from chest pain during exercise.
	Two months prior to admission	Exercise-electrocardiography test demonstrated ischaemic ST-segment depression in leads V3–V6.
	One month prior to admission	Coronary angiography was performed. Tandem lesion in the mid segment of the left anterior descending (LAD) was found.
	One day after admission	Optical coherence tomography (OCT)-guided percutaneous coronary intervention (PCI) was performed.
Case 2	Eight years prior to admission	Medical history of hypertension.
	Five months prior to admission	Patient was suffering from chest pain during exercise.
	One months prior to admission	Exercise-electrocardiography test demonstrated ischaemic ST-segment depression in leads V4–V6.
	Two weeks prior to admission	Coronary angiography was performed. Tandem lesion in the mid segment of the LAD was found.
	One day after admission	OCT-guided PCI was performed.